NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, all time — NPA 410
SPOK, INC. 28
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 410-232 not yet reported which blocks → SPOK, INC. 6630 BALTIMORE MD
— 410-283 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-331 not yet reported which blocks → SPOK, INC. 6630 ELKRIDGE MD
— 410-351 not yet reported which blocks → SPOK, INC. 6630 BALTIMORE MD
— 410-373 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-389 not yet reported which blocks → SPOK, INC. 6630 BALTIMORE MD
— 410-408 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-434 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-445 not yet reported which blocks → SPOK, INC. 6630 BALTIMORE MD
— 410-447 not yet reported which blocks → SPOK, INC. 6630 COLUMBIA MD
— 410-460 not yet reported which blocks → SPOK, INC. 6630 ELKRIDGE MD
— 410-473 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-475 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-492 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-607 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-640 not yet reported which blocks → SPOK, INC. 6630 BALTIMORE MD
— 410-678 not yet reported which blocks → SPOK, INC. 6630 ELKRIDGE MD
— 410-681 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-731 not yet reported which blocks → SPOK, INC. 6630 ANNAPOLIS MD
— 410-743 not yet reported which blocks → SPOK, INC. 6630 BALTIMORE MD
— 410-748 not yet reported which blocks → SPOK, INC. 6630 ELLICOTTCY MD
— 410-806 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-839 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-890 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-894 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-899 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-909 not yet reported which blocks → SPOK, INC. 6630 ELKRIDGE MD
— 410-932 not yet reported which blocks → SPOK, INC. 6630 ELKRIDGE MD

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.